Field attributes and organic geochemical analysis of shales from early to middle Permian Dohol Formation, Peninsular Malaysia: Implications for hydrocarbon generation potential

Alidu Rashid*, Numair Ahmed Siddiqui, Nisar Ahmed, Muhammad Jamil, Mohamed A.K. EL-Ghali, Syed Haroon Ali, Faisal Kamal Zaidi, Ali Wahid

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The early to middle Permian Dohol Formation falls under the Eastern Belt of Peninsular Malaysia. This formation is part of the Palaeozoic rock sequence in East Johor, composed of several metasedimentary, metamorphic, volcanic, and siliciclastic rocks. The Dohol Formation is said to have abundant black shales; however, the previous studies done in the area does not focus on the field attributes and the ability of the shales to generate hydrocarbons. Detailed traditional fieldwork was conducted in East Johor to characterize the shale facies of the formation. Different types of shale facies have been identified and interpreted in this study: (i) dark grey shale facies, (ii) light grey shale facies, (iii) red shale facies, and (iv) dark brown shale facies. XRD analysis was used to evaluate the mineralogy of the rock samples; the results show that the shales are primarily composed of kaolinite, illite, and quartz. The organic geochemical analysis also revealed that the samples collected had low TOC content, with an average TOC value of 0.40 wt%, with type II and type III kerogen predominating. The Ro and Tmax values and plots indicated that the samples are mature, with most already generating oil. The findings of this study suggest that the Dohol Formation has a low potential for generating hydrocarbons in commercial quantities, and also, the rocks are from a deep marine depositional setting.

Original languageEnglish
Article number102287
JournalJournal of King Saud University - Science
Volume34
Issue number8
DOIs
Publication statusPublished - Nov 2022

Keywords

  • Dohol Formation
  • Facies heterogeneity
  • Mineralogy
  • Rock Eval-Pyrolysis
  • Shale
  • TOC
  • XRD analysis

ASJC Scopus subject areas

  • General

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